Boron Carbide Particles Formed from an Amorphous Boron/Graphite Powder Mixture Using a Shock-Wave Technique

1996 ◽  
Vol 79 (4) ◽  
pp. 1113-1116 ◽  
Author(s):  
Kenjiro Yamada
Keyword(s):  
Shock Wave ◽  
Boron Carbide ◽  
Powder Mixture ◽  
Graphite Powder ◽  
Amorphous Boron ◽  
Wave Technique ◽  
Carbide Particles

Mechanical characterization of LM25 alloy matrix composite reinforced with boron carbide

2021 ◽  
pp. 002199832110055
Author(s):  
Zeeshan Ahmad ◽  
Sabah Khan
Keyword(s):  
Tensile Strength ◽  
Boron Carbide ◽  
Mechanical Characterization ◽  
Stir Casting ◽  
Surface Mapping ◽  
Alloy Matrix ◽  
Casting Technique ◽  
The Matrix ◽  
Carbide Particles

Alumnium alloy LM 25 based composites reinforced with boron carbide at different weight fractions of 4%, 8%, and 12% were fabricated by stir casting technique. The microstructures and morphology of the fabricated composites were studied by scanning electron microscopy and energy dispersive spectroscopy. Elemental mapping of all fabricated composites were done to demonstrate the elements present in the matrix and fabricated composites. The results of microstructural analyses reveal homogenous dispersion of reinforcement particles in the matrix with some little amount of clustering found in composites reinforced with 12% wt. of boron carbide. The mechanical characterization is done for both alloy LM 25 and all fabricated composites based on hardness and tensile strength. The hardness increased from 13.6% to 21.31% and tensile strength 6.4% to 22.8% as reinforcement percentage of boron carbide particles increased from 0% to 12% wt. A fractured surface mapping was also done for all composites.

Shock-wave compacting of a Fe-Ni-Al powder mixture and its study

2006 ◽  
Vol 102 (5) ◽  
pp. 541-544
Author(s):  
F. Kh. Akopov ◽  
V. M. Gabuniya ◽  
G. I. Mamniashvili ◽  
G. S. Martkoplishvili ◽  
G. Sh. Oniashvili ◽  
...  
Keyword(s):  
Shock Wave ◽  
Powder Mixture ◽  
Al Powder

Phase Studies in WC-Stainless Steel AISI 347 Hardmetal System with Graphite Addition

2014 ◽  
Vol 1024 ◽  
pp. 239-242
Author(s):  
Zuhailawati Hussain ◽  
Emee Marina Salleh ◽  
Tran Bao Trung ◽  
Zainal Arifin Ahmad
Keyword(s):  
Stainless Steel ◽  
Powder Mixture ◽  
Milled Powder ◽  
Graphite Powder ◽  
Planetary Mill ◽  
Argon Atmosphere ◽  
Maximum Hardness ◽  
Steel Container ◽  
Steel Aisi ◽  
Stainless Steel Aisi

In this study, WC-stainless steel AISI 347 hardmetal system was produced to replace WC-Co hardmetal which uses the expensive, toxic and depleted resource Co. WC, stainless steel AISI 347 and graphite powder mixture were milled in a planetary mill under argon atmosphere using a stainless steel container and balls. Carbon was added in amounts ranging from 0 wt% until 4 wt% into the composition to avoid unwanted η (Fe3W3C) phase. As-milled powder was compacted at 300 MPa and sintered in a tube furnace at 1350°C. ɳ phase was detected in compositions with 0 and 1 wt% C addition. For 2 wt% C addition, no η (Fe3W3C) phase formation was identified. However, the η phase was detected for compositions containing 3 and 4 wt% C. Maximum hardness was achieved due to the absence of η phase.

Microstructure and deposition mechanism of CVD amorphous boron carbide coatings deposited on SiC substrates at low temperature

2009 ◽  
Vol 35 (5) ◽  
pp. 1877-1882 ◽  
Author(s):  
Bin Zeng ◽  
Zude Feng ◽  
Siwei Li ◽  
Yongsheng Liu ◽  
Laifei Cheng ◽  
...  
Keyword(s):  
Low Temperature ◽  
Boron Carbide ◽  
Amorphous Boron ◽  
Deposition Mechanism ◽  
Carbide Coatings

scholarly journals Малогазовая детонация в низкоплотных механоактивированных порошковых смесях

2019 ◽  
Vol 89 (6) ◽  
pp. 821
Author(s):  
С.А. Рашковский ◽  
А.Ю. Долгобородов
Keyword(s):  
Experimental Data ◽  
Shock Wave ◽  
Energy Release ◽  
Powder Mixture ◽  
Powder Compaction ◽  
Mutual Friction ◽  
Low Density ◽  
Powder Mixtures ◽  
Release Wave ◽  
Fuel Particles

Experimental data on supersonic self-sustaining propagation of the energy release wave in low-density mechanically activated powder mixtures are analyzed. Various mechanisms that may be responsible for this process are analyzed, and a mechanism for the detonation-like propagation of the reaction in powder mixtures is proposed. It is shown that under certain conditions this process has all the signs of detonation and should be recognized as one of the types of detonation. It is shown that this type of detonation is fundamentally different from the classical "ideal" detonation, for example, in gases: instead of a shock wave, a compaction wave propagates through the powder mixture, in which there is basically no compression of the particle material, but powder compaction occurs due to the mutual rearrangement of particles. In this case, the initiation of a chemical reaction occurs due to the mutual friction of the oxidizer and fuel particles in the powder compaction wave.

scholarly journals Получение карбида бора в низковольтной электрической дуге постоянного тока, инициированной в открытом воздушном пространстве

2018 ◽  
Vol 44 (14) ◽  
pp. 26 ◽  
Author(s):  
А.Я. Пак ◽  
Г.Я. Мамонтов
Keyword(s):  
Boron Carbide ◽  
Arc Discharge ◽  
Electron Microscopic Examination ◽  
X Ray Diffraction ◽  
Electron Microscopic ◽  
Vacuum Equipment ◽  
X Ray ◽  
Gas Atmosphere ◽  
Average Size ◽  
Carbide Particles

AbstractWe describe a method of obtaining ultrafine boron carbide (B_13C_2) powder using the effect of a dc electric arc on a mixture of initial reactants containing carbon and boron. A peculiarity of the proposed method is that it can be implemented using arc discharge operating in open air without any vacuum equipment and protective inert gas atmosphere. X-ray diffraction data showed that the synthesized product in the general case contained three crystalline phases: boron carbide (B_13C_2), graphite (C), and boron oxide (B_2O_3). Electron-microscopic examination showed that the average size of boron carbide particles ranged from ~50 nm to ~2 μm.

scholarly journals Ceramics based on reactively sintered boron carbide

2018 ◽  
pp. 9-15
Author(s):  
A. I. Ovsienko ◽  
V. I. Rumyantsev ◽  
S. S. Ordanian
Keyword(s):  
Boron Carbide ◽  
Structure Formation ◽  
Process Parameters ◽  
Molten Silicon ◽  
Reactive Sintering ◽  
Negative Effect ◽  
Sintered Boron ◽  
Carbide Particles

The investigating results are given on the process parameters' influence on the phase and structure formation in the course of the B4C based materials' reactive sintering under the Si molten presence. The interaction of the B4C particles and carbon with the molten silicon was regarded during the reactive sintering. The negative effect of the B4C particles' dissolution in the molten silicon within the reactive sintering was noticed. The methods to raise the boron carbide particles' content in the ceramics based on the reactively sintered boron carbide were discussed.Ill. 10. Ref. 24. Tab. 1.

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